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Studies on Meson Spectroscopy --- Search for Exotic States

介子能谱研究——寻找奇异态

基本信息

批准号：
03044170
负责人：
TAKAMATSU Kunio
金额：
--
依托单位：
National Laboratory for High Energy Physics, KEK
依托单位国家：
日本
项目类别：
Grant-in-Aid for Overseas Scientific Survey.
财政年份：
1991
资助国家：
日本
起止时间：
1991 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03044170/
关键词：
GAMS Collaboration New meson states IHEP (Protvino, Russia)CERN KEK Data taking Partial wave analyses A qq exotic state

项目摘要

The GAMS Collaboration aims at searching for new meson states produced by the central collisions and the charge exchange process of pip and pp interactions. It consists of the two parts, i. e. one is the experiment, SERP-E-172 which uses 32 GeV pions produced by the 70 GeV Proton Synchrotron and the GAMS 47pi Spectrometer at IHEP (Protvino, Russia) in the framework of the sixth IHEP and CERN joint experiment programs and the other is the Experimental project, NA12/2 which uses 300 GeV pions and 450 GeV protons produced by the Super Proton Synchrotron. and the GAMS 4000 spectrometer at CERN. GAMS is a nickname of the spectrometer which detects energy and position of high energy gamma-rays decaying from neutral meson states produced in the reactions.The KEK group joined the collaboration in 1998 and have continued the work. Meanwhile, the agreement between KEK and IHEP have been signed up on the scientific collaboration for the GAMS experiment in 1990.We performed the experimental runnin … More g of 96 effective days between May and September in 1991 with the upgraded spectrometer system of GAMS 4000 at CERN and collected 80 millions of triggered events on the central collision production. During the run, we tested the new data acquisition system which has been developed by CERN and KEK groups and will be instaled in the next run of 1992. At IHEP, we performed the data taking run of 30 effective days with 32 GeV negative pions and the GAMS 4pi spectrometer. We have upgraded it for detecting charged particles decaying from meson states by installing large drift chambers. The readout system of signals of them has been developed and prepared by the KEK group. Partial wave analyses of the data are now under way.Meanwhile, we have analyzed etaeta' and omegapi^0 system of 1984-1987 data produced in the pip charge exchange processes. X (1910) has been found in the etaeta' final state. The state is expected to be a qq exotic one. X (2200) in the omegapi^0 final state has also been found. It has the same quantum numbers that of p (770) and is considered to be a radial and orbital excitation of p (770). These results of the analyses have been reported at fhe conference, Hadron9l and have been submitted for publication Less

GAMS协作组的目标是寻找由中心碰撞和pip与pp相互作用的电荷交换过程产生的新介子态。它包括两个部分，一是。e.一个是在第六个IHEP和CERN联合实验计划的框架内使用IHEP（Protvino，Russia）的70 GeV质子同步加速器和GAMS 47 pi谱仪产生的32 GeV π介子的实验SERP-E-172，另一个是使用超级质子同步加速器产生的300 GeV π介子和450 GeV质子的实验项目NA 12/2。和欧洲核子研究中心的GAMS 4000光谱仪。GAMS是一种光谱仪的别称，它可以探测从反应中产生的中性介子状态衰变出来的高能伽马射线的能量和位置。KEK小组于1998年加入了合作，并继续开展工作。1990年，KEK与IHEP签订了关于GAMS实验的科学合作协议。 ...更多信息 1991年5月至9月，利用改进后的CERN GAMS 4000谱仪系统，在96个有效日内，收集了8000万个中心碰撞产物的触发事件。在运行期间，我们测试了由CERN和KEK集团开发的新的数据采集系统，该系统将于1992年下一次运行时安装。在IHEP，我们用32 GeV负π介子和GAMS 4pi谱仪进行了30个有效日的数据采集。我们已经升级了它，通过安装大型漂移室来检测从介子状态衰变的带电粒子。它们的信号读出系统是由KEK集团研制的。同时，我们还对1984-1987年pip电荷交换过程中产生的etaeta和omegapi^0系统进行了分析。X（1910）在etaeta的最终态被发现。这个状态被认为是一个qq异域的状态。我们还发现了ω pi ^0末态的X（2200），它与p（770）的量子数相同，被认为是p（770）的径向和轨道激发。这些分析结果已在Hadron 9 l会议上报告，并已提交供出版。